improve view management:
- we can pass a negative view index, in this case we count from the end of the list of view
- before creating/changing the view representation, we remove the previous one and reinitialize the node visibility
- each time we save a view, it creates a new one at the end of the list
- "restore" view loads the last view of the list
// Simple persist middle ware
var path = require('path'),
fs = require('fs');
var jsonFile = path.join(__dirname,"example-cinema.json");
var resetFile = path.join(__dirname,"example-cinema-src.json");
exports.middleware = function(req, res, next) {
'use strict';
if (req.url !== '/simple-persist') {
return next();
}
res.setHeader('Content-Type', 'application/json; charset=utf-8');
res.statusCode = 200;
if(req.method === "PUT" || req.method === "POST") {
req.pipe(fs.createWriteStream(jsonFile));
setTimeout(function () {
res.end(JSON.stringify({result: "OK"}));
}, 3000);
}
else {
var params = require('url').parse(req.url),
readStream;
if('reset' in params && params.reset) {
readStream = fs.createReadStream(resetFile);
readStream.pipe(fs.createWriteStream(jsonFile));
}
else {
readStream = fs.createReadStream(jsonFile);
readStream.on('error',function() {
var srcFile = fs.createReadStream(resetFile);
srcFile.pipe(fs.createWriteStream(jsonFile));
srcFile.pipe(res);
});
}
readStream.pipe(res);
}
};